netdev - Re: BUG: unable to handle kernel NULL pointer dereference at virtual address 000000b0

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Date:	Thu, 18 Oct 2007 13:22:20 +0200 (CEST)
From:	Krzysztof Oledzki <olel@....pl>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	netdev@...r.kernel.org
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at virtual
 address 000000b0



On Wed, 17 Oct 2007, Eric Dumazet wrote:

> Krzysztof Oledzki a écrit :
>> 
>> 
>> On Wed, 17 Oct 2007, Eric Dumazet wrote:
>> 
>>> Krzysztof Oledzki a écrit :
>>>> 
>>>> 
>>>> On Wed, 17 Oct 2007, Eric Dumazet wrote:
>>>> 
>>>>> Krzysztof Oledzki a écrit :
>>>>>> Hello,
>>>>>> 
>>>>>> Today I found in my logs:
>>>>>> 
>>>>>> BUG: unable to handle kernel NULL pointer dereference at virtual 
>>>>>> address 000000b0
>>>>>>  printing eip:
>>>>>> 78395f65
>>>>>> *pde = 00000000
>>>>>> Oops: 0000 [#1]
>>>>>> PREEMPT SMP
>>>>>> CPU:    0
>>>>>> EIP:    0060:[<78395f65>]    Not tainted VLI
>>>>>> EFLAGS: 00210286   (2.6.22.9 #1)
>>>>>> EIP is at __ip_route_output_key+0x412/0x722
>>>>>> eax: 80000000   ebx: 00000000   ecx: 5dd2b1c3   edx: 00000000
>>>>>> esi: 00000000   edi: d44c7e30   ebp: ec8c4980   esp: d44c7ddc
>>>>>> ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068
>>>>>> Process smtpd (pid: 12479, ti=d44c6000 task=9e759510 task.ti=d44c6000)
>>>>>> Stack: d44c7e7c d44c7e7c d44c7eb8 00000000 d44c7e7c 00000000 00000000 
>>>>>> 00000005
>>>>>>        00000000 ffffffff 5dd2b1c3 00000000 00000000 00000000 00000000 
>>>>>> 00000000
>>>>>>        00000000 00000000 00000000 00000000 00000000 00030000 00000000 
>>>>>> d44c7e7c
>>>>>> Call Trace:
>>>>>>  [<78396280>] ip_route_output_flow+0xb/0x3e
>>>>>>  [<783b2b29>] ip4_datagram_connect+0x1c9/0x308
>>>>>>  [<783ba70a>] inet_dgram_connect+0x45/0x4e
>>>>>>  [<7837135e>] sys_connect+0x72/0x9c
>>>>>>  [<78371607>] sock_map_fd+0x41/0x4a
>>>>>>  [<7840d1b1>] _spin_lock+0x33/0x3e
>>>>>>  [<7840d623>] _spin_unlock+0x25/0x3b
>>>>>>  [<78371607>] sock_map_fd+0x41/0x4a
>>>>>>  [<78372792>] sys_socketcall+0x8f/0x242
>>>>>>  [<7813e99c>] trace_hardirqs_on+0x122/0x14c
>>>>>>  [<78103dc6>] sysenter_past_esp+0x8f/0x99
>>>>>>  [<78103d96>] sysenter_past_esp+0x5f/0x99
>>>>>>  =======================
>>>>>> Code: fa e0 00 00 00 75 07 c6 44 24 56 05 eb 14 81 fa f0 00 00 00 0f 84 
>>>>>> e1 02 00 00 84 c0 0f 84 d9 02 00 00 8b 44 24 0c 0d 00 00 00 80 <f6> 86 
>>>>>> b0 00 00 00 08 0f 44 44 24 0c 89 44 24 0c b8 01 00 00 00
>>>>>> EIP: [<78395f65>] __ip_route_output_key+0x412/0x722 SS:ESP 
>>>>>> 0068:d44c7ddc
>>>>>> 
>>>>>> Shortly before it there was:
>>>>>> Oct 17 07:17:55 cougar postfix/master[3400]: warning: process 
>>>>>> /usr/lib/postfix/smtpd pid 12479 killed by signal 11
>>>>>> 
>>>>>> Best regards,
>>>>>> 
>>>>>>
>>>>>>                 Krzysztof Olędzki
>>>>> 
>>>>> Hello Krzysztof
>>>>> 
>>>>> Could you give us some details about this ? kernel version at least.
>>>> 
>>>> Yes, I was little to hurry sending this bug report. Anyway, it is 
>>>> 2.6.22.9 like mentioned in the oops: EFLAGS: 00210286 (2.6.22.9 #1)
>>>> 
>>>>> (you could for example take a look at REPORTING-BUGS, or run
>>>>> scripts/ver_linux)
>>>> 
>>>> Linux cougar 2.6.22.9 #1 SMP PREEMPT Wed Oct 3 10:24:19 CEST 2007 i686 
>>>> Intel(R) Pentium(R) D CPU 3.20GHz GenuineIntel GNU/Linux
>>>> 
>>>> Gnu C                  4.1.2
>>>> Gnu make               3.81
>>>> binutils               2.17
>>>> util-linux             2.12r
>>>> mount                  2.12r
>>>> module-init-tools      3.2.2
>>>> e2fsprogs              1.40.2
>>>> Linux C Library        > libc.2.5
>>>> Dynamic linker (ldd)   2.5
>>>> Procps                 3.2.7
>>>> Net-tools              1.60
>>>> Kbd                    1.12
>>>> Sh-utils               6.9
>>>> 
>>> 
>>> Yes indeed, version was on your initial report.
>>> 
>>> It seems this kernel is unusual (VMSPLIT_2G_OPT instead of stdandard 
>>> VMSPLIT_3G), any chance you provide full .config ?
>> 
>> Attached, both .config and dmesg.
>> 
>
> Hum, you are using IPT_TPROXY thing, which is not in linux-2.6.22.9

It is only compiled in, not used at the moment.

> I have no idea how this can taint the kernel, since you provide no 
> information.
>
> Try to reproduce the problem with a genuine kernel.

OK. Thank you.

Best regards,

 				Krzysztof Olędzki